i disagree about type 4 hair being hardest to manage cause when i was a kid there were tons of long haired type 4 girls whose hair didn't have issues till it was relaxed.
I concur. I think type 4 hair gives people problems when they try to make it do things that aren't normal to it. WNG will not give you dangling ringlets like you get with type 3 hair. If you want to create that look, you'll have to shingle which is more work than I care to put in.
OP, you answer your own question when you start off saying that type 4 hair is the driest of all. Well, if that is true, why would you expect it to get "moisturized" after you fry it with heat, or break it down with chemicals?
Type 4 hair was never meant to be combed out everyday like white folks do to their hair. It wasn't meant to be fussed with the way some people tend to do and then complain of it being a pain. It's low manipulation hair. It's the easiest to hold a style which means you can set it and forget about it. It doesn't unravel and keeps the style till you decide you want a change. How is that hard work?
Also type 4 hair is the only hair that can sort of mimic every other hair and still rock its own styles that others can only envy. It can go from being very long to being very short. It can be flat-ironed to be straight. (When I flat-iron my hair, I don't moisturize it at all for the entire week it's straight and it stays soft and moisturized because I DC it well and seal it well with a serum.)
My hair has not been moisturized since 2010 and it isn't dry, because I wash it often (which is when it gets its moisture) and while I honestly haven't baggied in months, my hair still isn't as hard as I remember it being before I learned about DCing.
I think another mistake type 4 people make is believing in products "catered to natural hair" like CON shampoo. Just coz it feels good when you have it on wet hair, doesn't mean it's good at all. All it does is turn your hair into a dry brush when your hair is rinsed and dry. It's like it coats your hair with sap or snort.